If no one can live without groceries, then why do they cost less than big-screen TVs that no one really needs? Click or tap a choice to answer the question. The market for groceries is competitive, While the marginal utility yielded by whereas the market for TVs is an oligopoly. groceries is high, the total utility for groceries is low. It is much easier to substitute one kind of grocery item for another than one brand of Although demand is higher for groceries TV for another. than for TVs, supply is much greater for groceries